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ipv4: recompile ip options in ipv4_link_failure

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[ Upstream commit ed0de45a10 ]

Recompile IP options since IPCB may not be valid anymore when
ipv4_link_failure is called from arp_error_report.

Refer to the commit 3da1ed7ac3 ("net: avoid use IPCB in cipso_v4_error")
and the commit before that (9ef6b42ad6) for a similar issue.

Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Suryaputra 2019-04-12 16:19:27 -04:00 committed by Greg Kroah-Hartman
parent f052bafe54
commit 3d988fcddb
1 changed files with 9 additions and 1 deletions
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10
net/ipv4/route.c
View file

@ -1195,8 +1195,16 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
static void ipv4_link_failure(struct sk_buff *skb)
{
struct rtable *rt;
struct ip_options opt;
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
/* Recompile ip options since IPCB may not be valid anymore.
*/
memset(&opt, 0, sizeof(opt));
opt.optlen = ip_hdr(skb)->ihl*4 - sizeof(struct iphdr);
if (__ip_options_compile(dev_net(skb->dev), &opt, skb, NULL))
return;
__icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0, &opt);
rt = skb_rtable(skb);
if (rt)